/**
 * M-Team API 解析。
 *
 * 迁移自 MoviePilot e6820a8 `app/modules/indexer/spider/mtorrent.py` `MTorrentSpider`:
 * - `_movie_category/_tv_category/_music_category/_labels` → 同名常量
 * - `__get_params` → `mteamSearchParams`
 * - `__parse_result` → `parseMteamResult`
 * - `__find_imdbid / __get_downloadvolumefactor / __get_uploadvolumefactor` → 同名函数
 * - `_pageurl` → `page_url`
 *
 * 与 MP 的差异:
 * 1. 不生成 `[base64(json 含 x-api-key)]genDlToken` 形式的 enclosure(凭据不得进入候选对象,迁移账本 MT3),
 *    下载时由 adapter 现场调用 genDlToken(行为同 MP `_resolve_indirect_download_url`)。
 * 2. 额外输出 `category_id`(原始分类 ID),`category` 仍是 MP 的媒体类型投影。
 * 3. 额外保留 `status` 原文到 raw,便于核验。
 */
import type { MediaKind, MpMediaType, SpiderTorrent } from "../spider/spider.ts";

export const MOVIE_CATEGORY = ["401", "419", "420", "421", "439", "405", "404"];
export const TV_CATEGORY = ["403", "402", "435", "438", "404", "405"];
export const MUSIC_CATEGORY = ["434", "406"];

export const LABELS: Record<string, string> = {
  "0": "",
  "1": "DIY",
  "2": "国配",
  "3": "DIY 国配",
  "4": "中字",
  "5": "DIY 中字",
  "6": "国配 中字",
  "7": "DIY 国配 中字",
};

export const PAGE_SIZE = 100;

/** M-Team 种子 JSON(字段名按公开 API,待真实账号核验)。 */
export interface MteamTorrentJson {
  id: string | number;
  name?: string | null;
  smallDescr?: string | null;
  category?: string | number | null;
  size?: string | number | null;
  createdDate?: string | null;
  imdb?: string | null;
  douban?: string | null;
  labels?: string | number | null;
  labelsNew?: string[] | null;
  descr?: string | null;
  mediainfo?: string | null;
  status?: {
    seeders?: string | number | null;
    leechers?: string | number | null;
    timesCompleted?: string | number | null;
    discount?: string | null;
    discountEndTime?: string | null;
    promotionRule?: { discount?: string | null; endTime?: string | null } | null;
    mallSingleFree?: { status?: string | null; endDate?: string | null } | null;
  } | null;
  [k: string]: unknown;
}

/** MP `__get_params`(page 为 0 起) */
export function mteamSearchParams(keyword: string | null | undefined, mtype: MediaKind | undefined, page = 0) {
  let categories: string[];
  if (!mtype) categories = [];
  else if (mtype === "tv") categories = TV_CATEGORY;
  else if (mtype === "music") categories = MUSIC_CATEGORY;
  else categories = MOVIE_CATEGORY;
  // mtorrent 搜索 imdb 需要输入完整 imdb 链接(MP 注释引 wiki.m-team.cc/zh-tw/imdbtosearch)
  const kw = keyword?.startsWith("tt") ? `https://www.imdb.com/title/${keyword}` : (keyword ?? null);
  return { keyword: kw, categories, pageNumber: Number(page) + 1, pageSize: PAGE_SIZE, visible: 1 };
}

/** MP `__find_imdbid` */
export function findImdbid(imdb: string | null | undefined): string {
  return imdb ? (/tt\d+/.exec(imdb)?.[0] ?? "") : "";
}

/** MP `__get_downloadvolumefactor` */
export function getDownloadVolumeFactor(discount: string | null | undefined): number {
  const map: Record<string, number> = { FREE: 0, PERCENT_50: 0.5, PERCENT_70: 0.3, _2X_FREE: 0, _2X_PERCENT_50: 0.5 };
  return discount ? (map[discount] ?? 1) : 1;
}

/** MP `__get_uploadvolumefactor` */
export function getUploadVolumeFactor(discount: string | null | undefined): number {
  const map: Record<string, number> = { _2X: 2.0, _2X_FREE: 2.0, _2X_PERCENT_50: 2.0 };
  return discount ? (map[discount] ?? 1) : 1;
}

/**
 * MP `time_tools.format_timestamp`:非纯数字字符串原样返回;Unix 秒 → 本地墙钟 "YYYY-MM-DD HH:MM:SS"。
 * MP 用进程本地时区(容器默认 Asia/Shanghai);这里固定 +08:00,与 adapter 按 `umt.timezone`(+08:00)转 UTC 配套。
 */
function formatTimestamp(v: string | number | null | undefined): string | undefined {
  if (v == null) return undefined;
  if (typeof v === "string" && !/^\d+$/.test(v)) return v;
  const n = Number(v);
  if (!Number.isFinite(n)) return String(v);
  const d = new Date(Math.trunc(n) * 1000 + 8 * 3600_000);
  const p = (x: number) => String(x).padStart(2, "0");
  return `${d.getUTCFullYear()}-${p(d.getUTCMonth() + 1)}-${p(d.getUTCDate())} ${p(d.getUTCHours())}:${p(d.getUTCMinutes())}:${p(d.getUTCSeconds())}`;
}

function toInt(v: unknown): number {
  const n = Number.parseInt(String(v ?? "0") || "0", 10);
  return Number.isFinite(n) ? n : 0;
}

/** MP `__parse_result` */
export function parseMteamResult(results: MteamTorrentJson[] | null | undefined, webUrl: string): SpiderTorrent[] {
  const out: SpiderTorrent[] = [];
  if (!results) return out;
  const url = webUrl.endsWith("/") ? webUrl : `${webUrl}/`;
  for (const result of results) {
    const categoryValue = result.category == null ? undefined : String(result.category);
    let category: MpMediaType;
    if (categoryValue && MUSIC_CATEGORY.includes(categoryValue)) category = "音乐";
    else if (categoryValue && TV_CATEGORY.includes(categoryValue) && !MOVIE_CATEGORY.includes(categoryValue))
      category = "电视剧";
    else if (categoryValue && MOVIE_CATEGORY.includes(categoryValue)) category = "电影";
    else category = "未知";
    let labels: string[] = [];
    if (result.labelsNew && result.labelsNew.length > 0) labels = result.labelsNew.map(String);
    else {
      const v = LABELS[String(result.labels || "0")] ?? "";
      if (v) labels = v.split(/\s+/);
    }
    const status = result.status ?? {};
    const torrent: SpiderTorrent = {
      title: result.name ?? undefined,
      description: result.smallDescr ?? undefined,
      size: toInt(result.size),
      seeders: toInt(status.seeders),
      peers: toInt(status.leechers),
      grabs: toInt(status.timesCompleted),
      downloadvolumefactor: getDownloadVolumeFactor(status.discount),
      uploadvolumefactor: getUploadVolumeFactor(status.discount),
      page_url: `${url}detail/${result.id}`,
      imdbid: findImdbid(result.imdb),
      labels,
      category,
    };
    const pubdate = formatTimestamp(result.createdDate);
    if (pubdate) torrent.pubdate = pubdate;
    if (categoryValue) torrent.category_id = categoryValue;
    if (status.discountEndTime) torrent.freedate = formatTimestamp(status.discountEndTime);
    // 全站促销规则(当前馒头只有下载促销)
    if (status.promotionRule) {
      torrent.downloadvolumefactor = getDownloadVolumeFactor(status.promotionRule.discount ?? "NORMAL");
      if (status.promotionRule.endTime) torrent.freedate = formatTimestamp(status.promotionRule.endTime);
    }
    if (status.mallSingleFree && status.mallSingleFree.status === "ONGOING") {
      torrent.downloadvolumefactor = getDownloadVolumeFactor("FREE");
      if (status.mallSingleFree.endDate) torrent.freedate = formatTimestamp(status.mallSingleFree.endDate);
    }
    out.push(torrent);
  }
  return out;
}